2 .\" Copyright (c) 1997-2014 Erez Zadok
3 .\" Copyright (c) 1989 Jan-Simon Pendry
4 .\" Copyright (c) 1989 Imperial College of Science, Technology & Medicine
5 .\" Copyright (c) 1989 The Regents of the University of California.
6 .\" All rights reserved.
8 .\" This code is derived from software contributed to Berkeley by
9 .\" Jan-Simon Pendry at Imperial College, London.
11 .\" Redistribution and use in source and binary forms, with or without
12 .\" modification, are permitted provided that the following conditions
14 .\" 1. Redistributions of source code must retain the above copyright
15 .\" notice, this list of conditions and the following disclaimer.
16 .\" 2. Redistributions in binary form must reproduce the above copyright
17 .\" notice, this list of conditions and the following disclaimer in the
18 .\" documentation and/or other materials provided with the distribution.
19 .\" 3. Neither the name of the University nor the names of its contributors
20 .\" may be used to endorse or promote products derived from this software
21 .\" without specific prior written permission.
23 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 .\" File: am-utils/hlfsd/hlfsd.8
39 .\" HLFSD was written at Columbia University Computer Science Department, by
40 .\" Erez Zadok <ezk@cs.columbia.edu> and Alexander Dupuy <dupuy@smarts.com>
41 .\" It is distributed under the same terms and conditions as AMD.
48 .Nd home-link file system daemon
53 .Op Fl c Ar cache-interval
55 .Op Fl i Ar reload-interval
57 .Op Fl o Ar mount-options
58 .Op Fl x Ar log-options
59 .Op Fl D Ar debug-options
60 .Op Fl P Ar password-file
61 .Op Ar linkname Op Ar subdir
66 is a daemon which implements a file system containing a symbolic link to
67 subdirectory within a user's home directory, depending on the user
68 which accessed that link.
69 It was primarily designed to redirect
70 incoming mail to users' home directories, so that it can read from
76 operates by mounting itself as an
78 server for the directory containing
82 Lookups within that directory are handled by
84 which uses the password map to determine how to resolve the lookup.
85 The directory will be created if it does not already exist.
86 The symbolic link will be to the accessing user's home directory, with
93 This directory will also be created if it does not already exist.
99 will cause it to shutdown.
102 will flush the internal
103 caches, and reload the password map.
104 It will also close and
105 reopen the log file, to enable the original log file to be
109 will cause it to dump its internal
110 table of user IDs and home directories to the file
111 .Pa /usr/tmp/hlfsd.dump.XXXXXX .
113 .Bl -tag -width indent
116 The name of the directory to which
117 the symbolic link returned by
119 will point, if it cannot access the home directory of the user.
123 This directory will be created if it does not exist.
125 that either users will read these files, or the system administrators
126 will run a script to resend this
129 .It Fl c Ar cache-interval
134 will cache the validity of home directories for this interval, in
136 Entries which have been verified within the last
138 seconds will not be verified again, since the operation could
139 be expensive, and the entries are most likely still valid.
140 After the interval has expired,
142 will re-verify the validity of the user's home directory, and
143 reset the cache time-counter.
144 The default value for
146 is 300 seconds (5 minutes).
151 to skip startup-time consistency checks such as existence of mount
152 directory, alternate spool directory, symlink to be hidden under the
153 mount directory, their permissions and validity.
155 Set the special group
161 (which access the mailboxes of other users) must be setgid
166 If no group is provided,
167 and there is no group
169 this feature is disabled.
172 Print a brief help message, and exit.
173 .It Fl i Ar reload-interval
174 Map-reloading interval.
179 will reload the password map.
183 needs the password map for the UIDs and home directory pathnames.
188 to reload the password maps.
193 will force it to reload the maps immediately.
197 is 900 seconds (15 minutes).
199 Specify a log file to which
206 then the log messages will be sent to the system log daemon by
211 This is also the default.
217 will not verify the validity of the symbolic link it will be
218 returning, or that the user's home directory contains
219 sufficient disk-space for spooling.
222 at the cost of possibly returning symbolic links to home
223 directories which are not currently accessible or are full.
226 validates the symbolic-link in the background.
229 option overrides the meaning of the
231 option, since no caching is necessary.
232 .It Fl o Ar mount-options
236 will use to mount itself on top of
242 If the system supports symbolic-link caching, default
247 Outputs the process ID of
249 to standard output where it can be saved into a file.
252 Displays version information to standard error.
253 .It Fl x Ar log-options
254 Specify run-time logging options.
255 The options are a comma separated
257 .Li fatal , error , user , warn , info , map , stats , all .
261 to run on systems that cannot turn off the NFS attribute-cache.
263 this option on those systems is discouraged, as it may result in loss
264 or mis-delivery of mail.
265 The option is ignored on systems that can turn
266 off the attribute-cache.
267 .It Fl D Ar log-options
268 Select from a variety of debugging options.
270 option with the string
272 reverses the effect of that option.
273 Options are cumulative.
274 The most useful option is
276 Since this option is only used for debugging other options are not
278 A fuller description is available in the program
284 will cause it to dump its internal password map to the file
285 .Pa /usr/tmp/hlfsd.dump.XXXXXX .
286 .It Fl P Ar password-file
287 Read the user-name, user-id, and home directory information from the file
293 to read the password database.
294 This option allows you to override the
295 default database, and is useful if you want to map users' mail files to a
296 directory other than their home directory.
297 Only the username, uid, and
298 home-directory fields of the file
300 are read and checked.
301 All other fields are ignored.
304 must otherwise be compliant with
306 System 7 colon-delimited format
310 .Bl -tag -width ".Pa /var/hlfs"
312 directory under which
314 mounts itself and manages the symbolic link
317 default sub-directory in the user's home directory, to which the
319 symbolic link returned by
325 symbolic link returned by
327 points if it is unable to verify the that
328 user's home directory is accessible.
344 .%T HLFSD: Delivering Email to Your $HOME
345 .%B Proc. LISA-VII, The 7th Usenix System Administration Conference
354 .%B "Linux NFS and Automounter Administration"
355 .%O ISBN 0-7821-2739-8
360 .Pa http://www.am-utils.org/
367 .An Erez Zadok Aq ezk@cs.sunysb.edu ,
368 Computer Science Department, Stony Brook University, Stony Brook, New York, USA.
370 .An Alexander Dupuy Aq dupuy@smarts.com ,
371 System Management ARTS, White Plains, New York, USA.
373 Other authors and contributors to am-utils are listed in the
375 file distributed with am-utils.